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The structures of [Co(en)3][HgCl4I] and cis-[Co(en)2(NH3)(py)][Hg2Cl7] — complexes containing novel halo-mercury(II) anions

1989; Elsevier BV; Volume: 160; Issue: 1 Linguagem: Inglês

10.1016/s0020-1693(00)85402-x

1873-3255

Donald A. House, Vickie McKee, Ward T. Robinson,

Crystallography and molecular interactions

The single crystal X-ray structures of the title complexes have been determined. Racemic [Co(en)3][HgCl4I] (monoclinic, P21/a, a=13.488, b= 11.716, c=11.910 Å, β=109.82°, V=1770.6 Å3, Z=4, Dcalc=2.67 g/cc) consists of lel ob2 cations associated with [HgCl3I]2− and Cl− anions. Halo- mercury(II) distances within the irregular tetrahedral [HgCl3I]2− anion are HgI=2.65 Å and HgCl varies from 2.46 to 2.63 Å. Racemic-cis-[Co(en)2(NH3)(py)] [Hg2Cl7] (orthorhombic, Pbcn, a= 22.663, b=14.137, c=14.459 Å, V=4632 Å3, Z= 8, Dcalc=2.66 g/cc) consists of isolated δλ cations and weakly interacting dibridged [Hg2Cl7]3− anions. Within each [Hg2Cl7]3− unit, HgCl distances vary from 2.34–2.97 Å, and the closest HgCl approach between two adjacent [Hg2Cl7]3− units is 3.36 Å.